Code:
public class DoubleLink1 implements CellPhoneShell
{
private NodeData head;
private NodeData tail;
public DoubleLink1()
{
this.tail = null;
this.head = null;
}
public void add(Contact data)
public class DoubleLink1 implements CellPhoneShell
{
private NodeData head;
private NodeData tail;
public DoubleLink1()
{
this.tail = null;
this.head = null;
}
public void add(Contact data)
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